Jonathan Buckley is a novelist of unusual excellence, unusual not only because of his exceptional literary skills but in his preference for uncommon subjects and uncommon ways of approaching them.

Nostalgia, his 2013 novel about a small Tuscan town, viewed it from a multitude of angles: history, geography, changing residents, flora, fauna, festivals. The River Is the River (2015) called the nature and techniques of storytelling into question. Telescope (2011), a tour de force of imaginative vitality and buoyant wit, gradually revealed its narrator to be prematurely dying of a cruelly disfiguring disease.

The Great Concert of the Night seems a counterpart to that book. Where Telescope focused on a dying narrator, this novel, an equally scintillating display of literary flair, is narrated by a man whose lover, Imogen, has died. Beginning on New Year’s Day, he pens a daily entry throughout the ensuing year in a journal that commemorates her.

Linear narrative is rejected as inadequate. Instead the unnamed narrator, the director of a museum facing closure, opts for accumulating a miscellany of memories interspersed with accounts of his current experiences, reflections, people met and places visited. Descriptions recur of scenes from films featuring Imogen, an actress who gained notability in French art cinema. But she figures more compellingly (warm-hearted, impulsive but riskily impelled to defy taboos) in the narrator’s recollections of their time together.

Always excellent on social and family dynamics, Buckley surrounds Imogen and his narrator with keenly observed characters. Her part-French mother exemplifies a quality that fascinates him: elegant stoicism. At the opposite extreme to her mannerly self-containment is Val, a woman the narrator’s wife left him for years earlier. A voluble “life-coach” (“My promise: to be wholly present to the person I’m working with”) forever spouting modish verbiage and motivational banalities, she is such a relishable comic creation that you grin in anticipation when a journal entry announces, “A new message on Val’s homepage” or “Val’s thought for the month”.

Buckley’s virtuoso irony isn’t only directed at Val. A Gallic film director, whose pseudo-theories about the need for sexual “transgression” Imogen has naively absorbed, also comes under sardonic fire. Witty perfections of phrasing abound. A tête-à-tête with a compulsive talker “wasn’t so much a conversation as an attended monologue”. When the narrator politely declines the advances of a large, nude, genitally bejewelled Frenchwoman at a high-class orgy outside Paris, “ ‘Ah, English,’ she commiserated.”

Museums, the narrator says, offer “constellations of images”. So does this book. As previous novels have shown, Buckley has a mind like a cabinet of curiosities crammed with weird and wonderful stuff. Combining images of Imogen with choice specimens from it, he pieces together what you gradually recognise as a meaningful mosaic. Matching the book’s central subject, post-mortem motifs predominate: descriptions of Roman tombstones, decorated skeletons in German churches, mummified figures in Palermo’s catacombs. There’s engaging information about relics: how fragments of St Stephen are venerated in 300 different places; or, if the remnants of Mary Magdalene were reassembled she would have two heads and eight arms (one of which St Hugh of Lincoln is reported to have reverently nibbled). Among the book’s ravishingly visualised scenes of natural beauty, sunsets noticeably stand out. Transience and mortality suffuse Buckley’s novel but, in elating counterpoint, it sparkles with intelligence and zest for life’s pleasures.